FSK modulating apparatus

Details FSK modulating apparatus FSK modulating apparatus

1993-08-09

1995-07-18

Chin, Stephen

Pulse or digital communications

Transmitters

Angle modulation

331 2, 331 49, 375376, 332100, H03C 300, H03K 706, H04L 2712

Patent

active

054348889

ABSTRACT:
An FSK modulating apparatus includes a first phase locked loop arrangement having a first voltage controlled oscillator for generating a space frequency signal of a modulation signal and a second phase locked loop arrangement having a second voltage controlled oscillator for generating a mark frequency signal of the modulation signal. The apparatus also includes a third voltage controlled oscillator used to produce an FSK modulated output signal. After input data changes frequency to a space frequency or a mark frequency, a control voltage for the phase locked loop arrangement that is associated with the resulting frequency is routed through a low pass filter having a flat group delay characteristic to the third voltage controlled oscillator. After a set period of time has elapsed, the third voltage controlled oscillator replaces the voltage controlled oscillator of the particular phase locked loop arrangement associated with the current state of the modulator signal.

REFERENCES:
patent: 3993868 (1976-11-01), Balcewics
patent: 4628286 (1986-12-01), Nossen
patent: 4659999 (1987-04-01), Motoyama et al.

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